Masters Theses


"The flotation response of a lead ore was measured by utilization of a computer driven data acquisition system. A symmetric, fast and automatic froth removal and weighing system was attached to a conventional laboratory flotation cell. The rate controlling mechanisms were identified by manipulation of the froth removal rate, (FRR), froth layer thickness, (FT), and air flow rate, (AFR). The production of froth, water, solids and value in addition to value recovery and concentrate grade were determined as a function of time of flotation.

The flotation response was controlled by events dependent of AFR when using shallow froths of less than 0.5 cm FT and 50 rpm or higher FRR. The rate limiting stage was FRR at intermediate AFR and low FT. Conversely, when the FRR was decreased or the FT augmented, the global rate controlling mechanism was bubble emergence within the froth.

Statistical non-linear regression analysis of the experimental galena recovery data to various kinetic models showed that Huber's and Klimpel's models had the best agreement as compared to a first order model. This suggests that the floatability of galena is linearly proportional to its particle size.

The effect of AFR, FT and FRR on the Huber's model rate constant was also studied. These findings and the effects on the recovery, grade and kinetics are explained on the basis of coalescence, drainage and entrainment mechanisms. Finally, the cleaning action of the froth was found to be essentially dependent on the froth residence time"--Abstract, pages ii-iii.


Watson, John L.

Committee Member(s)

Morris, Arthur E., 1935-
Erten, Hayri


Materials Science and Engineering

Degree Name

M.S. in Metallurgical Engineering


The author is especially indebted to the Universidad Nacional Autonoma de Mexico, the Consejo Nacional de Ciencia y Tecnologia and the University of Missouri--Rolla for the moral and financial support which made possible this enterprise.


University of Missouri--Rolla

Publication Date

Summer 1987


x, 125 pages

Note about bibliography

Includes bibliographical references (pages 108-113).


© 1987 Jose Antonio Barrera-Godinez, All rights reserved.

Document Type

Thesis - Open Access

File Type




Thesis Number

T 5531

Print OCLC #


Included in

Metallurgy Commons